Listening to King Crimson's Starless Box right now and the show in Volkshaus, Zurich.

"The Law of Maximum Distress" is quite an interesting 13 minute improv that morphs into what became known as "The Mincer" then derails into something else as the band realizes the tape ran out. It then concludes almost exactly as it began. Really something. Here is the tail end of it from an audience source:https://youtu.be/jxIvMK77-_U

It took a while for the idea to catch on that if musicians were up and flying, burning, spraying, they weren't going to watch a clock telling them it was time to stop for a reel change. So, bound by the Law of Maximum Distress, reels are more likely to run-out in a feeble take than a hummer. But they will run out. ~Fripp